Hardboard 
 
4" x 4" x .125" Unisub Round Sublimation Blank Rustic Edge Hardboard Coaster, with cork backing. Gloss White. Rustic design gives an innovative, modern look on any home decor. 
 
Hardboard 
 
Heart-shaped hardboard coasters by Unisub make it easy to put your love on display! Decorate these quality coasters with photos of loved ones and use them every day! With a glossy top and cork backing, you can customize perfect gifts for Valentine's Day, anniversaries and wedding gifts. The premium gloss sublimation coating yields in brilliant colors with no hassle.
3.8" x 4" hardboard coasters with cork back #1-48cos